Testosterone is sometimes called the "male hormone,” but women’s bodies make it too. Women just make less of it than men. The hormone helps guys get facial and body hair, a deeper voice, and sperm. For women, testosterone seems to play a key role in sex drive.

Two different hormones play big roles in your appetite. One is called ghrelin, and it sends your body the message that it's time to eat. Another called leptin tells you you’re full. Scientists are studying these hormones to learn more about their role in weight loss and obesity.

A simple blood test should reveal if this gland in your neck is causing your weight change. Your thyroid makes hormones that help control your metabolism -- how fast your body turns food into nutrients and energy. When your thyroid doesn’t make enough of these hormones, that’s called hypothyroidism. When it’s making too much, that’s known as hyperthyroidism. Treatments can help with both of these conditions.

A woman’s levels of estrogen and another hormone called progesterone dip way down right before she gets her period. For some women, that drop can trigger migraine headaches.

Many teens get pimples as their hormones rise during puberty. When hormone levels go up, the skin makes more oil. And if oil gets clogged in skin cells, it can cause acne. The hormones also cause more bacteria on the skin that can lead to acne. For women, the shift in hormone levels before a period can also result in pimples. Some women find they have less breakouts when taking birth control pills.

Conditions including rheumatoid arthritis, asthma, and COPD are sometimes treated with medications called corticosteroids. These drugs are a lot like a hormone called cortisol that your body makes. It helps reduce inflammation inside you. Corticosteroids work the same way by lowering inflammation when your immune system mistakenly attacks and damages your own body tissues.  They’re different from the anabolic steroids that mimic testosterone and are sometimes used illegally to boost athletic performance.

Potato chips, popcorn, pretzels. Most of us enjoy an occasional salty treat. But really craving salt can be a symptom of Addison's disease, a rare disorder in which your body don’t make enough of the hormones cortisol and aldosterone. Only about 1 in 100,000 people have the disease. Other symptoms may include depression, dehydration, lightheadedness, sensitivity to cold, and muscle weakness.

When women start menopause and stop having periods, it’s a dramatic change in hormone levels. And it marks the end of their ability to have children. Men don't have such an abrupt shift in hormone levels, and they can still make sperm. Testosterone levels drop slowly. And as that happens, men may have weight gain, a lack of energy, and less interest in sex.

When love is in the air, oxytocin is working in the body. It’s released when we hug or cuddle, and it’s linked to the bonding between mates, and mother and child. It also helps mothers with labor and breastfeeding.